or 2 processes.
First bug is in testpar/t_mdset.c, where the test reports an error in
addition to skipping the test if there are less than three procs. Fix
to just skip the test.
Second bug is in testpar/t_dset.c in actual_io_mode tests, where
incorrect expected value for IO mode was set if the number of procs
running the test is 1.
tested with h5committest.